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| author | Neil MacIntosh <neilmac@microsoft.com> | 2016-09-29 12:58:55 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2016-09-29 12:58:55 -0700 |
| commit | 0edabdba0c717e4d87d9385616c3965c478d0d6f (patch) | |
| tree | d31f4974f995f81398451c6c3e962a46f56b5891 | |
| parent | 3e5af6dc4028416603e5d7a4adc93995eb34345f (diff) | |
| parent | 3161d6133fb0c05785e657acd4b178d0253e8319 (diff) | |
| download | platform_external_Microsoft-GSL-0edabdba0c717e4d87d9385616c3965c478d0d6f.tar.gz platform_external_Microsoft-GSL-0edabdba0c717e4d87d9385616c3965c478d0d6f.tar.bz2 platform_external_Microsoft-GSL-0edabdba0c717e4d87d9385616c3965c478d0d6f.zip | |
Add branch prediction to Ensures / Expects
| -rw-r--r-- | gsl/gsl_assert | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/gsl/gsl_assert b/gsl/gsl_assert index 10de31a..6d8760d 100644 --- a/gsl/gsl_assert +++ b/gsl/gsl_assert @@ -38,6 +38,14 @@ #define GSL_STRINGIFY_DETAIL(x) #x #define GSL_STRINGIFY(x) GSL_STRINGIFY_DETAIL(x) +#if defined(__clang__) || defined(__GNUC__) +#define GSL_LIKELY(x) __builtin_expect (!!(x), 1) +#define GSL_UNLIKELY(x) __builtin_expect (!!(x), 0) +#else +#define GSL_LIKELY(x) (x) +#define GSL_UNLIKELY(x) (x) +#endif + // // GSL.assert: assertions // @@ -53,19 +61,19 @@ struct fail_fast : public std::runtime_error #if defined(GSL_THROW_ON_CONTRACT_VIOLATION) #define Expects(cond) \ - if (!(cond)) \ + if (GSL_UNLIKELY(!(cond))) \ throw gsl::fail_fast("GSL: Precondition failure at " __FILE__ ": " GSL_STRINGIFY(__LINE__)); #define Ensures(cond) \ - if (!(cond)) \ + if (GSL_UNLIKELY(!(cond))) \ throw gsl::fail_fast("GSL: Postcondition failure at " __FILE__ \ ": " GSL_STRINGIFY(__LINE__)); #elif defined(GSL_TERMINATE_ON_CONTRACT_VIOLATION) #define Expects(cond) \ - if (!(cond)) std::terminate(); + if (GSL_UNLIKELY(!(cond))) std::terminate(); #define Ensures(cond) \ - if (!(cond)) std::terminate(); + if (GSL_UNLIKELY(!(cond))) std::terminate(); #elif defined(GSL_UNENFORCED_ON_CONTRACT_VIOLATION) |